11931880 has 32 divisors (see below), whose sum is σ = 26960040. Its totient is φ = 4752640.

The previous prime is 11931877. The next prime is 11931883. The reversal of 11931880 is 8813911.

It is an interprime number because it is at equal distance from previous prime (11931877) and next prime (11931883).

It can be written as a sum of positive squares in 4 ways, for example, as 7257636 + 4674244 = 2694^2 + 2162^2 .

It is not an unprimeable number, because it can be changed into a prime (11931883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12210 + ... + 13150.

Almost surely, 2^11931880 is an apocalyptic number.

11931880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11931880 is an abundant number, since it is smaller than the sum of its proper divisors (15028160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11931880 is a wasteful number, since it uses less digits than its factorization.

11931880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1269 (or 1265 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 31.

The square root of 11931880 is about 3454.2553466702. The cubic root of 11931880 is about 228.5088154391.

The spelling of 11931880 in words is "eleven million, nine hundred thirty-one thousand, eight hundred eighty".